Как изменить (3) цвета myGamePiece в моей игре, просто используя пробел с помощью JavaScript?

Question

Итак, вот мой код, над которым я работаю с использованием HTML5, CSS и Javascript:

function startGame() {

  myGameArea.start();
  //(width,height, "color", X,Y)
  //my character
  myGamePiece = new component(50, 50, "white", 0, 0);
  //obstacle
  myLines = new component(30, 89, "#1ab2ff", 1400, 70);
  myLines2 = new component(89, 30, "red", 0, 800);
}

//game platform
var myGameArea = {

  canvas: document.createElement("canvas"),
  start: function() {
    this.canvas.width = 1400;
    this.canvas.height = 789;
    this.context = this.canvas.getContext("2d");
    document.body.insertBefore(this.canvas, document.body.childNodes[0]);
    this.interval = setInterval(updateGameArea, 1);
    window.addEventListener('keydown', function(e) {
      myGameArea.key = e.keyCode;
    })
    window.addEventListener('keyup', function(e) {
      myGameArea.key = false;
    })
  },
  clear: function() {
    this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
  },
  stop: function() {
    clearInterval(this.interval);

  }
}

function component(width, height, color, x, y) {

  this.gamearea = myGameArea;
  this.width = width;
  this.height = height;
  this.speedX = 0;
  this.speedY = 0;
  this.x = x;
  this.y = y;
  this.update = function() {
    ctx = myGameArea.context;
    ctx.fillStyle = color;
    ctx.fillRect(this.x, this.y, this.width, this.height);
  }
  this.newPos = function() {
    this.x += this.speedX;
    this.y += this.speedY;

  }

  this.crashWith = function(otherobj) {

    var myLeft = this.x;
    var myRight = this.x + (this.width);
    var myTop = this.y;
    var myBottom = this.y + (this.height);
    var otherLeft = otherobj.x;
    var otherRight = otherobj.x + (otherobj.width);
    var otherTop = otherobj.y;
    var otherBottom = otherobj.y + (otherobj.height);

    var crash = true;
    if ((myBottom < otherTop) || (myTop > otherBottom) || (myRight < otherLeft) ||
      (myLeft > otherRight)) {
      crash = false;
    }
    return crash;
  }
}

//speed, controls, crashing
function updateGameArea() {


  myGamePiece.speedX = 0;
  myGamePiece.speedY = 0;
  if (myGameArea.key && myGameArea.key == 37) {
    myGamePiece.speedX = -1;
  }
  if (myGameArea.key && myGameArea.key == 39) {
    myGamePiece.speedX = 1;
  }
  if (myGameArea.key && myGameArea.key == 38) {
    myGamePiece.speedY = -1;
  }
  if (myGameArea.key && myGameArea.key == 40) {
    myGamePiece.speedY = 1;
  }

  if (myGamePiece.crashWith(myLines)) {
    myGameArea.stop();
  }
  if (myGamePiece.crashWith(myLines2)) {
    myGameArea.stop();
  } else {
    myGameArea.clear();
    myGamePiece.newPos();
    myGamePiece.update();
    // myLines.x (obstacles at x-axis) - (negative) or + (positive) of the x-axis = *value* (value=speed of the movement of the obstacle) 
    myLines.x -= 1;
    myLines.update();
    myLines2.y -= 1;
    myLines2.update();
  }
}

пожалуйста, мне здесь очень нужна помощь. :(

Я все еще новичок в javascript и хочу плохо учиться, пожалуйста, помогите мне.